膨润土-钢渣复合材料处理含Zn2+酸性矿山废水

摘要

通过震荡吸附试验，对比研究膨润土、钢渣、膨润土-钢渣复合粉末状材料、膨润土-钢渣复合颗粒材料对含Zn2+酸性矿山废水处理效果，确定最佳吸附材料及其最佳反应条件，结果表明：8∶2膨润土-钢渣复合粉末状材料对含Zn2+的酸性矿山废水处理效果最好；对于pH值为3~4、Zn2+质量浓度为50 mg/L的酸性矿山废水，当复合吸附剂用量为7 g/L、吸附时间为120 min时，对酸性矿山废水中Zn2+去除率可达98.43%，处理后水的pH值为7.8，可达标排放；膨润土-钢渣复合材料既释放碱度中和酸，同时又对Zn2+发生了吸附、沉淀、絮凝聚沉协同作用。%Comparative study was conducted using shake adsorption test with particle composites, including bentonite, slag, and powder-like bentonite-slag material, for treatment of acid mine wastewater containing Zn2+; the optimum adsorption material and best reaction condition were determined. Results showed that powder-like bentonite-slag material performed best. For acid mine wastewater with pH value of 3 to 4 and concentration of 50 mg/L, the removal ratio could reach 98.43%when adsorption agent dose was 7 g/L and adsorption time was 120 min;The pH value of treated water was 7.8 and met discharge standard. It was revealed that bentonite-slag material could release alkali to neutralize acid, and at the same time adsorb, precipitate and lfocculate Zn2+.